Samantha Pierre from Canada and Ary Trava from Mexico were the runners-up in the event held at the Ruben Dario National Theater in Nicaragua's capital Managua yesterday.
Kaur also won the prize for best national costume.
Xirelle Agustin from the Philippines won in the Teen Popularity category, while Nicole Obando from Costa Rica won the award for Teen Charm.
The six-year-old beauty pageant for teens aged 15 to 19 is held by the Miss Universe Organization.